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                【FOTILE模拟赛】L                </h1>
                <p>时间限制：15s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：162MB</p>			</div>
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                                <h3>题目描述</h3><p><div><span style="font-size: medium">FOTILE得到了一个长为N的序列A，为了拯救地球，他希望知道某些区间内的最大的连续XOR和。</span></div>
<div><span style="font-size: medium">即对于一个询问，你需要求出max(Ai xor Ai+1 xor Ai+2 ... xor Aj)，其中l&lt;=i&lt;=j&lt;=r。</span></div>
<div><span style="font-size: medium">为了体现在线操作，对于一个询问(x,y)：</span></div>
<div><span style="font-size: medium"><span style="color: rgb(0,0,32); line-height: normal; font-family: monospace; background-color: rgb(246,249,224); text-align: justify">l = min (&nbsp;</span><span style="color: rgb(0,0,32); line-height: normal; font-family: monospace; background-color: rgb(246,249,224); text-align: justify">((x+lastans) mod N)+1 ,&nbsp;((y+lastans) mod N)+1&nbsp;</span><span style="color: rgb(0,0,32); line-height: normal; font-family: monospace; background-color: rgb(246,249,224); text-align: justify">).<br />
r = max (&nbsp;((x+lastans) mod N)+1 ,&nbsp;((y+lastans) mod N)+1&nbsp;).</span></span></div>
<div style="text-align: justify"><span style="font-size: medium"><font face="monospace" color="#000020"><span style="line-height: normal">其中lastans是上次询问的答案，一开始为0。</span></font></span></div></p><hr/><h3>输入格式</h3><p><div><span style="font-size: medium">第一行两个整数N和M。</span></div>
<div><span style="font-size: medium">第二行有N个正整数，其中第i个数为Ai，有多余空格。</span></div>
<div><span style="font-size: medium">后M行每行两个数x,y表示一对询问。</span></div>
<div><span style="font-size: medium"><br />
</span></div>
<div></div></p><hr/><h3>输出格式</h3><p><div>
<h2 style="color: blue; line-height: normal; font-family: arial, verdana, helvetica, sans-serif">&nbsp;</h2>
</div>
<div><span style="font-size: medium">共M行，第i行一个正整数表示第i个询问的结果。</span></div></p><hr/><h3>样例输入</h3><pre>3 3
1 4 3
0 1
0 1
4 3


</pre><hr/><h3>样例输出</h3><pre>5
7
7</pre><hr/><h3>提示</h3><p><p><br />
HINT<br />
N=12000，M=6000，x,y,Ai在signed longint范围内。<br />
</p></p><hr/><h3>题目来源</h3><p>By seter</p>
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